Many CT scanners have a weight limit of 300 to 400 pounds and a circumferential girth limit of 60 cm.
A patient with an acute abdomen should not be inflated with room air or CO2, and a consultation with a surgeon is most appropriate. Patients with active diverticulitis should not be referred to CT colonography. If an abscess or free air is suspected, a CT of the abdomen and pelvis can be performed with oral and IV contrast. Insufflation of the colon is contraindicated and may cause perforation and widespread peritonitis. Similarly, if a patient has recently undergone pelvic or abdominal surgery, in the past four months, insufflation of the colon is contraindicated. Patients with a known history of colonic hernia or toxic megacolon should also not undergo colonoscopy or CTC.
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